php如何去除字符串两端的0

php如何去除字符串两端（第一个和最后一个）的0，下面编程教程网小编给大家详细介绍一下实现代码！

利用str_replace()函数去除两端的0

<?php
header('content-type:text/html;charset=utf-8');   
$str = "0123asdf01210";
echo "原字符串：".$str;
echo "<br>处理后：".str_replace("0","",$str);
?>

利用substr_replace()函数去除指定位置的0

<?php
header('content-type:text/html;charset=utf-8');   
$str = "01230asdf01210";
echo "原字符串：".$str."<br><br>";
echo "去除开头的0：".substr_replace($str,"",0,1)."<br><br>";
echo "去除末尾的0：".substr_replace($str,"",-1,1)."<br><br>";
echo "去除第5字符0：".substr_replace($str,"",4,1)."<br><br>";
echo "去除第10字符0：".substr_replace($str,"",9,1)."<br><br>";
?>